You don't need the voice of Visayas and Mindanao to overthrow the government. All you need to have is the support of the majority of the bishops, a few celebrities, a few senators who flip sides depending on the situation, a military personel who have a major post in the government, a few students who loves to go on rally, and some people who doesn't have any job and would rather attend on a rally and be on tv. And press people from major networks who will cover the story.
And lastly, a fresh face that does not YET have any tainted marks (meaning erap and chronies is not an option), lets say the Gov. of Pampanga?